/* Loading 图层 */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.8);
    z-index: 20; /* 确保覆盖其他内容 */
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    font-family: Arial, sans-serif;
    color: #333;
    text-align: center;
}

.loading-overlay .spinner {
    border: 6px solid #f3f3f3;
    border-top: 6px solid #3498db;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}
